The Bolometer
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In our eReader you can find the full English version of the book. Read The Bolometer Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Bolometer
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Now if one wire only be warmed, the current in one wire is diminished while the other flows as before. The needle is then deflected by a force equal to the difference of the two currents, and proportionate at the same time to the power of the battery and to the (possibly very feeble) radiation which warmed the wire, and which thus has been employed to modulate a force enormously greater than its own, which may be in one sense said to be magnified in pro- portion. The analogy with the finger and... throttle-valve is not far to seek, and the principle thus stated is not hard to grasp, but the application in the concrete working tool is difficult. I have not yet resolved all difficulties by any means, but as I have brought the new apparatus to the point where it is a real meas- urer of radiant heat, more delicate, and I believe more accu- rate than the thermopile, I feel warranted in describing it even in its actual condition of progress. I should first observe, that since it is by a changed resistance, that we work, we should have a large part of the resistance of the circuit in the small part on which the exciting ray falls, and that to enable it to receive and part with its heat rapidly, the conducting wire should in this portion be laminated, so as to present a greatly increased surface with the same cross section.
What to read after The Bolometer?
You can find similar books in the "Read Also" column, or choose other free books by S P Samuel Pierpont Langley to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Now if one wire only be warmed, the current in one wire is diminished while the other flows as before. The needle is then deflected by a force equal to the difference of the two currents, and proportionate at the same time to the power of the battery and to the (possibly very feeble) radiation which warmed the wire, and which thus has been employed to modulate a force enormously greater than its own, which may be in one sense said to be magnified in pro- portion. The analogy with the finger and... throttle-valve is not far to seek, and the principle thus stated is not hard to grasp, but the application in the concrete working tool is difficult. I have not yet resolved all difficulties by any means, but as I have brought the new apparatus to the point where it is a real meas- urer of radiant heat, more delicate, and I believe more accu- rate than the thermopile, I feel warranted in describing it even in its actual condition of progress. I should first observe, that since it is by a changed resistance, that we work, we should have a large part of the resistance of the circuit in the small part on which the exciting ray falls, and that to enable it to receive and part with its heat rapidly, the conducting wire should in this portion be laminated, so as to present a greatly increased surface with the same cross section.
What to read after The Bolometer?
You can find similar books in the "Read Also" column, or choose other free books by S P Samuel Pierpont Langley to read onlineMoreLess
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